C# Win32 lock checking

Win32FileInspector.cs

internal static class FileInspector
{
    [DllImport("kernel32.dll")]
    private static extern Microsoft.Win32.SafeHandles.SafeFileHandle CreateFile(string lpFileName, System.UInt32 dwDesiredAccess, System.UInt32 dwShareMode, IntPtr pSecurityAttributes, System.UInt32 dwCreationDisposition, System.UInt32 dwFlagsAndAttributes, IntPtr hTemplateFile);

    private static readonly uint GENERIC_WRITE = 0x40000000;
    private static readonly uint OPEN_EXISTING = 3;

    [DllImport("kernel32.dll")]
    [return: MarshalAs(UnmanagedType.Bool)]
    private static extern bool CloseHandle(SafeHandle hObject);

    /// <summary>
    /// Determines whether the specified file is currently in use by another process
    /// </summary>
    /// <param name="path">The full local path of the file to inspect</param>
    /// <returns>True if the file exists and is currently locked, otherwise false.</returns>
    public static bool Locked(string path)
    {
        if (!File.Exists(path))
            return false;

        SafeHandle handle = null;
        try
        {
            handle = CreateFile(path, GENERIC_WRITE, 0, IntPtr.Zero, OPEN_EXISTING, 0, IntPtr.Zero);

            return handle.IsInvalid;
        }
        finally
        {
            if(handle != null)
            {
                CloseHandle(handle);
            }
        }
    }
}